StarFive Fan-Tach controller can support up to 16 fan tach input.
The series has been tested on the EVB1 board.

Change since v2:

PATCH 2:
- Fix typo in commit message: than ==> then
- Remove struct device *dev and struct mutex lock from struct starfive_fan_tach_data.
- Change return type of starfive_fan_tach_get_ch_en() to bool.
- Simplify the condition check in starfive_fan_read() by removing the unnecessary
  intermediate ret variable assignment when checking the tachometer channel enable
  status.
- Return an error when tach_ch >= STARFIVE_FAN_TACH_CH.
- Add a description that accessing the fan status can be time-consuming in certain
  scenarios in starfive-fan-tach.rst.

v2: https://lore.kernel.org/all/20260819091601.41077-1-changhuang.liang@starfivetech.com/
v1: https://lore.kernel.org/all/20260428082337.743546-1-changhuang.liang@starfivetech.com/

Changhuang Liang (2):
  dt-bindings: hwmon: Add starfive,jhb100-fan-tach
  hwmon: (starfive-fan-tach) Add fan tach driver for StarFive JHB100

 .../hwmon/starfive,jhb100-fan-tach.yaml       |  93 +++
 Documentation/hwmon/index.rst                 |   1 +
 Documentation/hwmon/starfive-fan-tach.rst     |  38 ++
 MAINTAINERS                                   |   8 +
 drivers/hwmon/Kconfig                         |  14 +
 drivers/hwmon/Makefile                        |   1 +
 drivers/hwmon/starfive-fan-tach.c             | 540 ++++++++++++++++++
 7 files changed, 695 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/starfive,jhb100-fan-tach.yaml
 create mode 100644 Documentation/hwmon/starfive-fan-tach.rst
 create mode 100644 drivers/hwmon/starfive-fan-tach.c

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2.25.1